Trying to make Qt HUD in OSG, camera issue

Question

I'm kind of newbie in both OSG and Qt, still I'm trying to make Qt HUD upon my OSG window, what I want is Qt interface elements fixed inside OSG scene, not spinning with the model. The thing is, I need Qt elements INSIDE osg scene, not OSG scene inside Qt window (like in OSGviewerQt example).

What I've got yet is OSGQtWidgets example with --useWidgetImage --fullscreen arguments, which shows fixed Qt controls ontop of OSG Model. The thing is, it creates new (FIXED) camera for qt element ontop of OSG model -- because of that, user cannot spin and move OSG model because camera is not transparent.

So the question is: is there a way to make transparent camera with useable Qt elements in it? Or is there some other way to achieve my goals?

Thank you in advance!

Answer 1

I am unable to try this out for myself first, but you can try setting a property on the Orthogonal "HUD" camera to let events pass through to the regular OSG viewer:

camera->setAllowEventFocus(false);

If you're using a recent version of osgQtWidgets.cpp, you'd want to add this around line 414.